1. A CONVEYOR COMPRISING A FRAME; ARTICLE-CONVEYING ROLLERS ROTATABLY MOUNTED ON SAID FRAME TO CARRY AN ARTICLE MOVING ALONG SAID CONVEYOR; DRIVING MEANS ADJACENT SAID ROLLERS COMPRISING A CARRIER MEMBER HAVING A TUBULAR WALL THE UPPER WALL PORTION OF WHICH DEFINES AN UPWARDLYOPEN EXTERNAL CHANNEL HAVING A CONTINUOUS LONGITUDINALLYEXTENDING EXTERNAL UPWARDLY-FACING BELT-SUPPORTING SURFACE BOREDED BY CONTINUOUS LONGITUDINALLY-EXTENDING SHOULDERS FOR GUIDING A BELT RUN LONGITUDINALLY ON SAID CARRIER MEMBER IN SAID EXTERNAL CHANNEL, THE LOWER WALL PORTION OF SAID CARRIER MEMBER DEFINING AN INTERNAL UPWARDLY-FACING OPEN CHANNEL BELOW SAID EXTERNAL UPWARDLU-FACING BELT SUPPORTING SURFACE, AND A NARROW, THICK, ENDLESS BELT SUPPORTED BY SAID CARRIER MEMBER WITH ITS UPPER BELT RUN SLIDABLY CARRIED BY SAID EXTERNAL CHANNEL OF SAID CARRIER MEMBER WITH THE UPPER PORTION OF SAID UPPER BELT RUN PROJECTING ABOVE SAID SHOULDERS AND GUIDED LONGITUDINALLY OF SAID CARRIER MEMBER SOLELY BY SLIDING ENGAGEMENT OF SAID BELT RUN WITH SAID EXTERNAL CHANNEL AND WITH ITS LOWER RUN PASSING THROUGH SAID CARRIER MEMBER AND SLIDABLY CARRIED IN GUIDED RELATION IN SAID INTERNAL CHANNEL; AND MEANS FOR SUPPORTING SAID CARRIER MEMBER IN RELAITON TO SAID ROLLERS SO SAID UPPER RUN OF SAID BELT ENGAGES AN ARTICLE CARRIED BY SAID ROLLERS TO MOVE SAID ARTICLE ALONG SAID CONVEYOR IN THE DIRECTION OF MOVEMENT OF SAID UPPER BELT RUN.